Friday 12 March

How it was decided

1. 01

   Aṅga

   Pūrṇimā runs from 02:55 on Thu 11 Mar to 05:34 on Fri 12 Mar.

   1971-03-10T23:55:29Z → 1971-03-12T02:33:34Z

2. 02

   Kāla

   Sāyāhna is last 3 of 15 day muhūrtas: 15:37–17:59 on the 10th, 15:37–18:00 on the 11th.

   sayahna: day-muhurta-13-15 · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Pūrṇimā must be present during sāyāhna. It covers 0 of 142 minutes on the 10th and 142 of 142 on the 11th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

4. 04

   Tie-break

   Only one late afternoon qualifies. No tie-break is needed.

   priority: unstated → only-day · margin 32172 s

5. 05

   Counted

   Holī is kept the day after Holikā Dahana: Thursday 11 March is the day taken above.

   follows: holika-dahana + 1 d

6. 06

   Ruling

   Holī, Riyadh, 1971: Friday 12 March.

   confidence: determinate

Say it like this

In Riyadh, Holī 1971 falls on Friday 12 March. It is kept the day after Holikā Dahana, which falls on Thursday 11 March. Pūrṇimā runs from 02:55 on Thu 11 Mar to 05:34 on Fri 12 Mar and covers all of sāyāhna on the 11th.

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Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.